2172565105 has 4 divisors (see below), whose sum is σ = 2607078132. Its totient is φ = 1738052080.

The previous prime is 2172565103. The next prime is 2172565121. The reversal of 2172565105 is 5015652712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 735548641 + 1437016464 = 27121^2 + 37908^2 .

It is not a de Polignac number, because 2172565105 - 2¹ = 2172565103 is a prime.

It is a super-2 number, since 2×2172565105² = 9440078270927322050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2172565103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217256506 + ... + 217256515.

It is an arithmetic number, because the mean of its divisors is an integer number (651769533).

Almost surely, 2^2172565105 is an apocalyptic number.

It is an amenable number.

2172565105 is a deficient number, since it is larger than the sum of its proper divisors (434513027).

2172565105 is an equidigital number, since it uses as much as digits as its factorization.

2172565105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434513026.

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 2172565105 is about 46610.7831408141. The cubic root of 2172565105 is about 1295.1625154441.

The spelling of 2172565105 in words is "two billion, one hundred seventy-two million, five hundred sixty-five thousand, one hundred five".